Offset-free DC-coupled analog frontend circuit for high-dynamic-range signals

Ya-Fei Du; Jun Wu; Chen Yuan; Chuan-Fei Zhang; Yi-Nong Liu

doi:10.1007/s41365-020-0746-4

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Offset-free DC-coupled analog frontend circuit for high-dynamic-range signals

NUCLEAR ELECTRONICS AND INSTRUMENTATION | Updated：2021-01-26

- Offset-free DC-coupled analog frontend circuit for high-dynamic-range signals
- Nuclear Science and Techniques Vol. 31, Issue 4, Article number: 35(2020)
- Affiliations：
  
  1.Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  2.Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
- Author bio：
  
  Corresponding author, dyf13@tsinghua.org.cn
- Funds：
- DOI：10.1007/s41365-020-0746-4
  CLC：
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Ya-Fei Du, Jun Wu, Chen Yuan, et al. Offset-free DC-coupled analog frontend circuit for high-dynamic-range signals. [J]. Nuclear Science and Techniques 31(4):35(2020)
DOI：

Ya-Fei Du, Jun Wu, Chen Yuan, et al. Offset-free DC-coupled analog frontend circuit for high-dynamic-range signals. [J]. Nuclear Science and Techniques 31(4):35(2020) DOI： 10.1007/s41365-020-0746-4.

摘要

Abstract

The analog frontend (AFE) coupling circuit is a crucial processing element for data acquisition systems based on analog-to-digital converters (ADCs). Currently, high-speed and high-resolution ADCs are predominantly designed with differential input stages. Conventional high-speed ADC drivers are mainly AC-coupled by employing transformers (Baluns) or fully differential amplifiers (FDAs) with blocking capacitors. However, the results of this study indicate that a certain degree of DC offset error exists and manifests itself as the baseline error in the presence of power dividers connecting several DC-coupled channels that implement high-dynamic-range (HDR) signal conditioning. The study involves a theoretical analysis and explanation of the baseline offset error. The offset error can potentially lead to unexpected out-of-range issues for sampling devices, including high-speed ADCs and switched capacitor array ASICs. High-performance FDAs are adopted, and an offset-free DC-coupled AFE circuit is proposed to address the aforementioned issue using two-stage amplification and a resistive attenuator. The proposed methodology is verified via circuit simulations and hardware design. Thus, the baseline offset problem can be accurately solved using the proposed circuit by minimizing the neglectable error. The proposed circuit facilitates improvements in the high-precision measurement of HDR signals in many nuclear physics experiments and some applications in the DC-coupling scheme with FDAs involving resistive power dividers.

关键词

Keywords

Offset-freeDC-coupledTwo-stage amplificationResistive attenuatorHigh-Dynamic-Range

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